November 18, 2013: Drug Use Among American Workers Declined 74% Over the Past 25 Years, Finds Unprecedented Analysis of More Than 125 Million Workplace Urine Drug Tests. Read our blog series or watch our archived webinar called "25 Years of Workplace Drug Testing in America: Milestones and Lessons Learned Since the Drug-Free Workplace Act of 1988." Download the Drug Testing Index 25th Anniversary brochure.